Rollup of 5 pull requests

compiler/rustc_ast_lowering/src/lifetime_collector.rs

@@ -1,7 +1,7 @@
 use super::ResolverAstLoweringExt;
 use rustc_ast::visit::{self, BoundKind, LifetimeCtxt, Visitor};
 use rustc_ast::{GenericBounds, Lifetime, NodeId, PathSegment, PolyTraitRef, Ty, TyKind};
-use rustc_hir::def::LifetimeRes;
+use rustc_hir::def::{DefKind, LifetimeRes, Res};
 use rustc_middle::span_bug;
 use rustc_middle::ty::ResolverAstLowering;
 use rustc_span::symbol::{kw, Ident};
@@ -77,7 +77,20 @@ impl<'ast> Visitor<'ast> for LifetimeCollectVisitor<'ast> {
     }
 
     fn visit_ty(&mut self, t: &'ast Ty) {
-        match t.kind {
+        match &t.kind {
+            TyKind::Path(None, _) => {
+                // We can sometimes encounter bare trait objects
+                // which are represented in AST as paths.
+                if let Some(partial_res) = self.resolver.get_partial_res(t.id)
+                    && let Some(Res::Def(DefKind::Trait | DefKind::TraitAlias, _)) = partial_res.full_res()
+                {
+                    self.current_binders.push(t.id);
+                    visit::walk_ty(self, t);
+                    self.current_binders.pop();
+                } else {
+                    visit::walk_ty(self, t);
+                }
+            }
             TyKind::BareFn(_) => {
                 self.current_binders.push(t.id);
                 visit::walk_ty(self, t);

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -245,50 +245,41 @@ fn exported_symbols_provider_local(
         ))
     }
 
+    // Rust assumes that all code provided to (non-plugin) LTO comes from Rust, so it knows about
+    // all symbols that are involved. This doesn't hold up for symbols that get injected by LLVM,
+    // so they need to be special-cased.
+    let mut externally_injected_weak_symbols = Vec::new();
     if tcx.sess.instrument_coverage() || tcx.sess.opts.cg.profile_generate.enabled() {
         // These are weak symbols that point to the profile version and the
         // profile name, which need to be treated as exported so LTO doesn't nix
         // them.
-        const PROFILER_WEAK_SYMBOLS: [&str; 2] =
-            ["__llvm_profile_raw_version", "__llvm_profile_filename"];
-
-        symbols.extend(PROFILER_WEAK_SYMBOLS.iter().map(|sym| {
-            let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
-            (
-                exported_symbol,
-                SymbolExportInfo {
-                    level: SymbolExportLevel::C,
-                    kind: SymbolExportKind::Data,
-                    used: false,
-                },
-            )
-        }));
+        externally_injected_weak_symbols.push("__llvm_profile_raw_version");
+        externally_injected_weak_symbols.push("__llvm_profile_filename");
     }
-
     if tcx.sess.opts.unstable_opts.sanitizer.contains(SanitizerSet::MEMORY) {
-        let mut msan_weak_symbols = Vec::new();
-
         // Similar to profiling, preserve weak msan symbol during LTO.
         if tcx.sess.opts.unstable_opts.sanitizer_recover.contains(SanitizerSet::MEMORY) {
-            msan_weak_symbols.push("__msan_keep_going");
+            externally_injected_weak_symbols.push("__msan_keep_going");
         }
-
         if tcx.sess.opts.unstable_opts.sanitizer_memory_track_origins != 0 {
-            msan_weak_symbols.push("__msan_track_origins");
+            externally_injected_weak_symbols.push("__msan_track_origins");
         }
-
-        symbols.extend(msan_weak_symbols.into_iter().map(|sym| {
-            let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
-            (
-                exported_symbol,
-                SymbolExportInfo {
-                    level: SymbolExportLevel::C,
-                    kind: SymbolExportKind::Data,
-                    used: false,
-                },
-            )
-        }));
     }
+    if tcx.sess.opts.unstable_opts.sanitizer.contains(SanitizerSet::ADDRESS) {
+        // Similar to profiling, preserve weak asan symbols during LTO.
+        externally_injected_weak_symbols.push("___asan_globals_registered");
+    }
+    symbols.extend(externally_injected_weak_symbols.into_iter().map(|sym| {
+        let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
+        (
+            exported_symbol,
+            SymbolExportInfo {
+                level: SymbolExportLevel::C,
+                kind: SymbolExportKind::Data,
+                used: false,
+            },
+        )
+    }));
 
     if tcx.crate_types().contains(&CrateType::Dylib)
         || tcx.crate_types().contains(&CrateType::ProcMacro)

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -1681,7 +1681,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             || found_assoc(tcx.types.u64)
             || found_assoc(tcx.types.u128)
             || found_assoc(tcx.types.f32)
-            || found_assoc(tcx.types.f32);
+            || found_assoc(tcx.types.f64);
         if found_candidate
             && actual.is_numeric()
             && !actual.has_concrete_skeleton()

compiler/rustc_smir/src/rustc_smir/mod.rs

@@ -1165,7 +1165,9 @@ impl<'tcx> Stable<'tcx> for rustc_middle::mir::ConstantKind<'tcx> {
                     let const_val = tables.tcx.valtree_to_const_val((c.ty(), val));
                     stable_mir::ty::ConstantKind::Allocated(new_allocation(self, const_val, tables))
                 }
-                _ => todo!(),
+                ty::ParamCt(param) => stable_mir::ty::ConstantKind::ParamCt(opaque(&param)),
+                ty::ErrorCt(_) => unreachable!(),
+                _ => unimplemented!(),
             },
             ConstantKind::Unevaluated(unev_const, ty) => {
                 stable_mir::ty::ConstantKind::Unevaluated(stable_mir::ty::UnevaluatedConst {

compiler/rustc_smir/src/stable_mir/ty.rs

@@ -417,6 +417,7 @@ pub fn allocation_filter<'tcx>(
 pub enum ConstantKind {
     Allocated(Allocation),
     Unevaluated(UnevaluatedConst),
+    ParamCt(Opaque),
 }
 
 #[derive(Clone, Debug)]

tests/codegen/sanitizer/address-sanitizer-globals-tracking.rs

@@ -0,0 +1,36 @@
+// Verifies that AddressSanitizer symbols show up as expected in LLVM IR
+// with -Zsanitizer (DO NOT SUBMIT: add ASAN (no LTO) and ASAN-LTO2 (lto=fat) tests).
+//
+// Notes about the `compile-flags` below:
+//
+// * The original issue only reproed with LTO - this is why this angle has
+//   extra test coverage via different `revisions`
+// * To observe the failure/repro at LLVM-IR level we need to use `staticlib`
+//   which necessitates `-C prefer-dynamic=false` - without the latter flag,
+//   we would have run into "cannot prefer dynamic linking when performing LTO".
+//
+// needs-sanitizer-address
+//
+// revisions:ASAN ASAN-LTO
+//[ASAN]     compile-flags: -Zsanitizer=address
+//[ASAN-LTO] compile-flags: -Zsanitizer=address -C prefer-dynamic=false -C lto
+
+#![crate_type="staticlib"]
+
+// The test below mimics `CACHED_POW10` from `library/core/src/num/flt2dec/strategy/grisu.rs` which
+// (because of incorrect handling of `___asan_globals_registered` during LTO) was incorrectly
+// reported as an ODR violation in https://crbug.com/1459233#c1.  Before this bug was fixed,
+// `___asan_globals_registered` would show up as `internal global i64`.
+//
+// See https://github.com/rust-lang/rust/issues/113404 for more discussion.
+//
+// CHECK: @___asan_globals_registered = common hidden global i64 0
+// CHECK: @__start_asan_globals = extern_weak hidden global i64
+// CHECK: @__stop_asan_globals = extern_weak hidden global i64
+#[no_mangle]
+pub static CACHED_POW10: [(u64, i16, i16); 4] = [
+    (0xe61acf033d1a45df, -1087, -308),
+    (0xab70fe17c79ac6ca, -1060, -300),
+    (0xff77b1fcbebcdc4f, -1034, -292),
+    (0xbe5691ef416bd60c, -1007, -284),
+];

tests/ui/impl-trait/fresh-lifetime-from-bare-trait-obj-114664.rs

@@ -0,0 +1,22 @@
+// edition:2015
+// check-pass
+// issue: 114664
+
+fn ice() -> impl AsRef<Fn(&())> {
+    //~^ WARN trait objects without an explicit `dyn` are deprecated
+    //~| WARN trait objects without an explicit `dyn` are deprecated
+    //~| WARN trait objects without an explicit `dyn` are deprecated
+    //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+    //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+    //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+    Foo
+}
+
+struct Foo;
+impl AsRef<dyn Fn(&())> for Foo {
+    fn as_ref(&self) -> &(dyn for<'a> Fn(&'a ()) + 'static) {
+        todo!()
+    }
+}
+
+pub fn main() {}

tests/ui/impl-trait/fresh-lifetime-from-bare-trait-obj-114664.stderr

@@ -0,0 +1,42 @@
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/fresh-lifetime-from-bare-trait-obj-114664.rs:5:24
+   |
+LL | fn ice() -> impl AsRef<Fn(&())> {
+   |                        ^^^^^^^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+   = note: `#[warn(bare_trait_objects)]` on by default
+help: use `dyn`
+   |
+LL | fn ice() -> impl AsRef<dyn Fn(&())> {
+   |                        +++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/fresh-lifetime-from-bare-trait-obj-114664.rs:5:24
+   |
+LL | fn ice() -> impl AsRef<Fn(&())> {
+   |                        ^^^^^^^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+help: use `dyn`
+   |
+LL | fn ice() -> impl AsRef<dyn Fn(&())> {
+   |                        +++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/fresh-lifetime-from-bare-trait-obj-114664.rs:5:24
+   |
+LL | fn ice() -> impl AsRef<Fn(&())> {
+   |                        ^^^^^^^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+help: use `dyn`
+   |
+LL | fn ice() -> impl AsRef<dyn Fn(&())> {
+   |                        +++
+
+warning: 3 warnings emitted
+

triagebot.toml

@@ -490,7 +490,7 @@ cc = ["@nnethercote"]
 [assign]
 warn_non_default_branch = true
 contributing_url = "https://rustc-dev-guide.rust-lang.org/getting-started.html"
-users_on_vacation = ["jyn514", "WaffleLapkin", "clubby789"]
+users_on_vacation = ["jyn514", "WaffleLapkin", "clubby789", "oli-obk"]
 
 [assign.adhoc_groups]
 compiler-team = [